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Convert matplotlib contour plots to geojson

Project description

# geojsoncontour
[![Build Status](https://travis-ci.org/bartromgens/geojsoncontour.svg?branch=master)](https://travis-ci.org/bartromgens/geojsoncontour) [![PyPI version](https://badge.fury.io/py/geojsoncontour.svg)](https://badge.fury.io/py/geojsoncontour) [![Coverage Status](https://coveralls.io/repos/github/bartromgens/geojsoncontour/badge.svg?branch=master)](https://coveralls.io/github/bartromgens/geojsoncontour?branch=master)
A Python 3 module to convert matplotlib contour plots to geojson. Supports both contour and contourf plots.

Designed to show geographical [contour plots](http://matplotlib.org/examples/pylab_examples/contour_demo.html),
created with [matplotlib/pyplot](https://github.com/matplotlib/matplotlib), as vector layer on interactive slippy maps like [OpenLayers](https://github.com/openlayers/ol3) and [Leaflet](https://github.com/Leaflet/Leaflet).

Demo project that uses geojsoncontour: [climatemaps.romgens.com](http://climatemaps.romgens.com)

![geojson contour demo usage](https://raw.githubusercontent.com/bartromgens/geojsoncontour/master/data/example_climatemaps.png)

## Installation
Install with pip,
```
$ pip install geojsoncontour
```

## Usage

Use `contour_to_geojson` to create a geojson with contour lines from a `matplotlib.contour` plot (not filled).
Use `contourf_to_geojson` to create a geojson with filled contours from a `matplotlib.contourf` plot.

### Contour plot to geojson
```python
import numpy
import matplotlib.pyplot as plt
import geojsoncontour

# Create contour data lon_range, lat_range, Z
<your code here>

# Create a contour plot plot from grid (lat, lon) data
figure = plt.figure()
ax = figure.add_subplot(111)
contour = ax.contour(lon_range, lat_range, Z, cmap=plt.cm.jet)

# Convert matplotlib contour to geojson
geojson = geojsoncontour.contour_to_geojson(
contour=contour,
ndigits=3,
unit='m'
)
```
For filled contour plots (`matplotlib.contourf`) use `contourf_to_geojson`.
See [example_contour.py](examples/example_contour.py) and [example_contourf.py](examples/example_contourf.py) for simple but complete examples.

### Show the geojson on a map
An easy way to show the generated geojson on a map is the online geojson renderer [geojson.io](http://geojson.io).

### Style properties
Stroke color and width are set as geojson properties following https://github.com/mapbox/simplestyle-spec.

### Create geojson tiles
Try [geojson-vt](https://github.com/mapbox/geojson-vt) or [tippecanoe](https://github.com/mapbox/tippecanoe) if performance is an issue and you need to tile your geojson contours.


## Tests

Run all tests,
```
python -m unittest discover
```

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